Abstract
This chapter explores the unsteady incompressible flow separation. Steady flow separation is most common; consequently, this type of flow has been much more widely investigated compared to unsteady separation. Problems of unsteady flow in the boundary layer may arise from boundaries moving in a time-variable fashion or from fluctuations in the mainstream. When flow starts from rest, the fluid flow is unsteady, and separation occurs in such unsteady flow. Boundary layer separation after impulsive start of motion is divided into two classes, namely, two-dimensional and axially symmetric unsteady flow separation. The analysis of the boundary layer on a rotating cylinder started impulsively is given by Tollmien. A special kind of unsteady separation of laminar flow from a moving wall, which may occur on the blades of compressors, has been investigated by Ludwig and Brady and Ludwig.
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